CPC Main Group
C01B 21/00 Nitrogen; Compounds thereof
6 direct subcodes
Child Classifications
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- C01B 21/02 Preparation of nitrogen (by decomposition of ammonia C01B3/047)
- C01B 21/04 Purification or separation of nitrogen (by liquefying F25J)
- C01B 21/06 Binary compounds of nitrogen with metals, with silicon, or with boron, (azides C01B21/08)
- C01B 21/08 Hydrazoic acid; Azides; Halogen azides
- C01B 21/082 Compounds containing nitrogen and non-metals (C01B21/06, C01B21/08 take precedence)
- C01B 21/20 Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
Top Applicants
Top 10 applicants by patent filingsfor class C01, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 4,293
- LG CHEM KR 3,317
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 2,219
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,154
- OMYA INTERNATIONAL CH 1,524
- PANASONIC INTELLECTUAL PROPERTY JP 1,362
- SAUDI ARABIAN OIL COMPANY SA 1,298
- SUMITOMO METAL MINING COMPANY JP 1,286
- CENTRAL SOUTH UNIVERSITY 1,243
- L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE FR 1,238